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Sensitive and High-Throughput Analyses of Purine Metabolites by Dynamic pH Junction Multiplexed Capillary Electrophoresis: A New Tool for Metabolomic Studies

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Abstract

On-line sample preconcentration by a dynamic pH junction in conjunction with multiplexed capillary electrophoresis (CE) and UV detection represents a sensitive and high-throughput format for future metabolomic research, such as purine analysis. The optimization of purine focusing can be rapidly assessed by systematically altering the sample matrix properties, such as the buffer co-ion, pH and ionic strength using a 96-capillary array format. This method permits focusing of large sample injection volumes, resulting in over a 50-fold improvement in the concentration sensitivity. The limit of detection (S/N = 3) for purine metabolites was less than 8.0 × 10–8 M under optimum conditions when using UV absorbance. Dynamic pH junction multiplexed CE demonstrated excellent linearity over a hundred-fold concentration range, as well as low inter-capillary precision in terms of normalized migration times and peak areas. The potential for clinically relevant high-throughput analyses of micromolar amounts of purine metabolites in urine was also demonstrated.

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Authors and Affiliations

  1. Graduate School of Science, Himeji Institute of Technology, Kamigori, Hyogo, 678-1297, Japan

    Philip Britz-Mckibbin & Shigeru Terabe

  2. Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan

    Takaaki Nishioka

Authors
  1. Philip Britz-Mckibbin
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  2. Takaaki Nishioka
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  3. Shigeru Terabe
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Correspondence to Philip Britz-Mckibbin.

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Britz-Mckibbin, P., Nishioka, T. & Terabe, S. Sensitive and High-Throughput Analyses of Purine Metabolites by Dynamic pH Junction Multiplexed Capillary Electrophoresis: A New Tool for Metabolomic Studies. ANAL. SCI. 19, 99–104 (2003). https://doi.org/10.2116/analsci.19.99

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  • DOI: https://doi.org/10.2116/analsci.19.99

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